Can't post long - am at work - but Flynnie has always woken up thru the night. He was BF to 9 months when I got pg with Little One and I have noticed no difference in his wakings with him on formula. I am convinced sometimes he's hungry, sometimes he's not. Personally i never expected him to "sleep thru" while BF because of what you said about BM digesting quicker than formula, and I think that women do put too high an expectation on "sleeping" thru. Yeah, it can suck when your babe won't sleep and you are exhausted - but I thinkI would have had a harder time if I actually felt like I could "do better" and get him to sleep longer. Sometimes I think the expectation you put on yourself as a mum can make you feel worse than you otherwise would IYKWIM?